set_git_dir: handle feeding gitdir to itself
[git.git] / reachable.c
blobd1ac5d97efdaff5dc971e38da278dcf1d820ef2c
1 #include "cache.h"
2 #include "refs.h"
3 #include "tag.h"
4 #include "commit.h"
5 #include "blob.h"
6 #include "diff.h"
7 #include "revision.h"
8 #include "reachable.h"
9 #include "cache-tree.h"
10 #include "progress.h"
11 #include "list-objects.h"
12 #include "packfile.h"
14 struct connectivity_progress {
15 struct progress *progress;
16 unsigned long count;
19 static void update_progress(struct connectivity_progress *cp)
21 cp->count++;
22 if ((cp->count & 1023) == 0)
23 display_progress(cp->progress, cp->count);
26 static int add_one_ref(const char *path, const struct object_id *oid,
27 int flag, void *cb_data)
29 struct rev_info *revs = (struct rev_info *)cb_data;
30 struct object *object;
32 if ((flag & REF_ISSYMREF) && (flag & REF_ISBROKEN)) {
33 warning("symbolic ref is dangling: %s", path);
34 return 0;
37 object = parse_object_or_die(oid, path);
38 add_pending_object(revs, object, "");
40 return 0;
44 * The traversal will have already marked us as SEEN, so we
45 * only need to handle any progress reporting here.
47 static void mark_object(struct object *obj, const char *name, void *data)
49 update_progress(data);
52 static void mark_commit(struct commit *c, void *data)
54 mark_object(&c->object, NULL, data);
57 struct recent_data {
58 struct rev_info *revs;
59 timestamp_t timestamp;
62 static void add_recent_object(const struct object_id *oid,
63 timestamp_t mtime,
64 struct recent_data *data)
66 struct object *obj;
67 enum object_type type;
69 if (mtime <= data->timestamp)
70 return;
73 * We do not want to call parse_object here, because
74 * inflating blobs and trees could be very expensive.
75 * However, we do need to know the correct type for
76 * later processing, and the revision machinery expects
77 * commits and tags to have been parsed.
79 type = sha1_object_info(oid->hash, NULL);
80 if (type < 0)
81 die("unable to get object info for %s", oid_to_hex(oid));
83 switch (type) {
84 case OBJ_TAG:
85 case OBJ_COMMIT:
86 obj = parse_object_or_die(oid, NULL);
87 break;
88 case OBJ_TREE:
89 obj = (struct object *)lookup_tree(oid);
90 break;
91 case OBJ_BLOB:
92 obj = (struct object *)lookup_blob(oid);
93 break;
94 default:
95 die("unknown object type for %s: %s",
96 oid_to_hex(oid), typename(type));
99 if (!obj)
100 die("unable to lookup %s", oid_to_hex(oid));
102 add_pending_object(data->revs, obj, "");
105 static int add_recent_loose(const struct object_id *oid,
106 const char *path, void *data)
108 struct stat st;
109 struct object *obj = lookup_object(oid->hash);
111 if (obj && obj->flags & SEEN)
112 return 0;
114 if (stat(path, &st) < 0) {
116 * It's OK if an object went away during our iteration; this
117 * could be due to a simultaneous repack. But anything else
118 * we should abort, since we might then fail to mark objects
119 * which should not be pruned.
121 if (errno == ENOENT)
122 return 0;
123 return error_errno("unable to stat %s", oid_to_hex(oid));
126 add_recent_object(oid, st.st_mtime, data);
127 return 0;
130 static int add_recent_packed(const struct object_id *oid,
131 struct packed_git *p, uint32_t pos,
132 void *data)
134 struct object *obj = lookup_object(oid->hash);
136 if (obj && obj->flags & SEEN)
137 return 0;
138 add_recent_object(oid, p->mtime, data);
139 return 0;
142 int add_unseen_recent_objects_to_traversal(struct rev_info *revs,
143 timestamp_t timestamp)
145 struct recent_data data;
146 int r;
148 data.revs = revs;
149 data.timestamp = timestamp;
151 r = for_each_loose_object(add_recent_loose, &data,
152 FOR_EACH_OBJECT_LOCAL_ONLY);
153 if (r)
154 return r;
155 return for_each_packed_object(add_recent_packed, &data,
156 FOR_EACH_OBJECT_LOCAL_ONLY);
159 void mark_reachable_objects(struct rev_info *revs, int mark_reflog,
160 timestamp_t mark_recent, struct progress *progress)
162 struct connectivity_progress cp;
165 * Set up revision parsing, and mark us as being interested
166 * in all object types, not just commits.
168 revs->tag_objects = 1;
169 revs->blob_objects = 1;
170 revs->tree_objects = 1;
172 /* Add all refs from the index file */
173 add_index_objects_to_pending(revs, 0);
175 /* Add all external refs */
176 for_each_ref(add_one_ref, revs);
178 /* detached HEAD is not included in the list above */
179 head_ref(add_one_ref, revs);
181 /* Add all reflog info */
182 if (mark_reflog)
183 add_reflogs_to_pending(revs, 0);
185 cp.progress = progress;
186 cp.count = 0;
189 * Set up the revision walk - this will move all commits
190 * from the pending list to the commit walking list.
192 if (prepare_revision_walk(revs))
193 die("revision walk setup failed");
194 traverse_commit_list(revs, mark_commit, mark_object, &cp);
196 if (mark_recent) {
197 revs->ignore_missing_links = 1;
198 if (add_unseen_recent_objects_to_traversal(revs, mark_recent))
199 die("unable to mark recent objects");
200 if (prepare_revision_walk(revs))
201 die("revision walk setup failed");
202 traverse_commit_list(revs, mark_commit, mark_object, &cp);
205 display_progress(cp.progress, cp.count);